Automatic weft-bobbin-exchange device for looms.



L KOBCHLIN.

AUTOMATIC WEFT BOBBIN EXGHAN GE DEVICE FOR LOOMS APPLICAUON FILED SEPT. 24, X913.

Patented Aug 11, 1914.

2 SHEETS SIUCETI lvihwmco G. KOBOHLIN.

AUTOMATIC WEFT BOBBi 1,1U6fi16.

xcmmz DEVICE FOR LOOMS APPLICATION FILED SEPT,

Patented Aug. 11. 1914.

ZSHEETS SHEETZ would be possible, the

thread end of one bobbin BASEL, SWITZERLAND, ASSIGNOR T0 DRAPER GOM- ALBERT GEORG KOECHLIN, OF

, I all PANY, 0F HOPEDALE, MASSACHUSETTS, A CORPORATION OF MAINE.

AUTOMATIC WEFT-BOBBIN-EXCHANGE DEVICE FOR LOOMS.

To all whom it may concern:

Be it known that I, ALBERT GEORG KoEcH- LIN, a citizen of the Swiss Republic, and resident of Basel, Switzerland, have invented new and useful Improvements in Automatic lVeft-Bobbin-Exchange Devices for Looms, of which the following is a full, clear, and exact specification.

It is well known in weft bobbin exchange devices for looms to put the thread ends of the bobbins on an endless card band movably arranged lengthwise on one side of the bobbin supply channel connected with the bobbin magazine, so that they are held by the teeth of said band and conveyed by the latter together with the bobbins toward the exchange point, and as an advantage of said arrangement, it is stated that the thread ends may finally fall by their proper weight and the trepidations of the loom from the teeth of the band when by the movement of the latter the teeth come to a position where they are turned downward. This advantage cannot be obtained by the arrangement of a card band, for in practice the threads can never be laid sufliciently loosely upon the card teeth to allow them to fall down when the teeth are directed downward, or if this threads may fail to be taken along with the band toward the exchange point.

According to the present invention, the endless thread conveying member on the side of the bobbin supply channel, shifted forward step by step, is provided with spring clasps each desi ed to receive the and from which the thread ends, after the threading-in of the bobbins, are gradually drawn off by means of a drawing-0d cone rotating intermittently in accordance with the step by step movement of said clasp member, so as to gradually wind the thread ends upon it, in order to automatically and ositively clean the clasps and to thus renser them capable of being furnished with a new set of threads.

The annexed drawing represents an embodiment of the improved device.

Figure 1 is a plan view of the improved mechanism; Fig. 2 is a side elevation thereof;- Fig. 3 is a detailed view illustrating a different position of the bobbin transferrer;

Specification of Letters Patent. Application filed September 24:, 1913.

Patented Aug. 111, 191141.. Serial No. 791,545.

l and Fig. 4 is a detailcdperspective View of a portion of the endless clasp member.

On one side of the bobbin supply channel Z) which leads from the bobbin magazine a to the exchange point is arranged an endless band or belt 0 provided at its inner side with blocks or projections, guided over two drive wheels d, al and furnished on its outer side with a series of distinct spring clasps f. Each of these spring clasps is designed to receive the thread end ofone of the bobbins lying in the channel I) and is capable of retaining it owing to its proper elasticity. At each bobbin exchange, the bobbins in the channel I) slide successively downward and at the same time, a ratchet and pawl device shifts the clasp belt 0 forward step by step with the thread ends retained by its clasps, so that the thread ends may always remain properly in the axis of the corresponding bobbins. The thread ends, when being introduced into the spring clasps f, are also slightly wound upon a drawing-off cone 9 rigidly connected to the wheel of and thus rotating therewith step by step around its own axis. By this intermittent rotation of the cone 9, the thread ends are gradually wound more and more upon it and finally drawn out of ing-in of the bobbins in the shuttle and the severing of the threads, so that the clasps f are automatically and positively cleaned, while the thread ends do not freely hang down, but are collected on the cone 9 in the form of. a coil or skein which may easily be withdrawn therefrom.

What I claim is:

1. 'In an automatic weft bobbin exchange device for looms, the combination with a bobbin magazine and a bobbin supply chan nel leading therefrom to the exchange point of an endless thread retaining member having spring clasps for the thread ends of the bobblns in said channel, drive means for intermittently shifting said endless member with the thread'ends retained by its clasps, and an intermittently rotating drawing-01f cone for drawing the thread ends out of the clasps of said endless member to clean the same.

2. In an automatic weft bobbin exchange device for looms, the combination with a bobbin magazine and a bobbin supply chanthe clasps f, after the threadnel leading therefrom to the exchan e point, of an endless thread retaining mem er having spring Clasps for the thread ends of the bobbins in said channel, drive Wheels for guiding and driving said endless member, automatic means for intermittently rotating said Wheels to shift said member forward step by step and a drawing-off cone for drawing the thread ends out of the clasps of said endless member by Winding them upon it so as to clean the clasps, said drawin -ofl' cone being connected to one of said drlve wheels so as to perform an intermittent rotating movement.

In Witness whereof I have hereunto signed 1.5 my name this 5th day of August 1913, in the presence of two subscribing Witnesses.

ALBERT GEORG KOECHLIN.

Witnesses ARNOLD ZUBER, AMAND RII'IER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents Washington, D. 0." 

